Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc15f744bb176d7…

MALICIOUS

PDF

93.1 KB Created: 2021-07-05 21:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f22ef9d9c2890814809c62894f047f6e SHA-1: e376fb9447d1a9ca3925715f6f29fa6e7c20cfdc SHA-256: 5fc15f744bb176d77f6ad306d80b4050d005b75dba02c75364b4113a21c004b5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://falconfam.com/ckfinder/userfiles/files/19186364614.pdf
    • http://nusratali.com/userfiles/files/31994725818.pdf
    • https://m-isc.com/userfiles/file/mobudalalav.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nbn0tur0qr218ulj691iq5q56k/ramajib.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dsugk96u2thi45ls92pnvp1bdi/dozojozelusexevabapajel.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/43b784e1a499c5a6d24b9cf0130f2e18/fogafufotiseguwav.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16092c0385c530---vasiwipiduvekonupazogolo.pdf
    • http://metaglas.kr/userData/board/file/95691501179.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a84fe79d2---wopudisevenazes.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ea762b09d583b0eb4ff5ff0f62e4ae1d/rulojeridadipumafufod.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aa881d1b15e---4431609610.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad7e6250e---jatupuvitudokubepixa.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/73596452690.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26f6b0a00c---4474082761.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076369d1b54f---wozupuguxevatopu.pdf
    • http://abpaluso.com/upload/file/8982967830.pdf
    • https://argumentua.com/i/file/kidoturaxarusatumoju.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5714fd66bdacca59de6763378359b2c3/66352187530.pdf
    • https://jamurgoreng.net/contents//files/98368388063.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/2835643593.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=plants+vs+zombies+2+mod+apk+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f206.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 16792 bytes
font_01_sfnt_off00010a1d.bin
afb413ae7b8a62baf3c29d30bc1eb5ed2b97639ea0aa9524acfcdcfcf262f849
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 11032 bytes
font_02_sfnt_off000123a1.bin
386fa8faf5bb235edd278ac40ce309b52c34ad77fa9608e9313ba2cdeb6f958f
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 17308 bytes
font_03_sfnt_off000150a5.bin
0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
pdf-font-stream PDF embedded font (sfnt) at offset 0x150A5 16376 bytes